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19 7 19 8 19 9 20 0 20 1 20 2 20 3 20 4 20 5 20 6 20 7 1946 1945 1944 1943 1942 1941 1940 1939 1938 1937

= Free Coordinate    = Occupied(Single Region)     = Occupied (Var Region)     = Center of the grid